1-hydroxy-6-amino alkoxy-phenazine 5,10-dioxides

ABSTRACT

6-Substituted derivatives of 1-phenazinol 5,10-dioxide which possess broad spectrum anti-microbial activity are disclosed.

United States Patent Leimgruber et al.

[451 Aug. 1, 1972 [5 l-HYDROXY-6-AMINO ALKOXY- PHENAZINE 5,10-DIOXIDES [72] Inventors: Willy Leimgruber, Montclair; Manfred Weigele, North Caldwell, both of NJ.

[73] Assignee: Hoffmann-La Roche Inc., Nutley,

22 Filed: April 2,1970

[21] Appl. No.: 25,298

[52] US. Cl ..260/247.5 R, 260/267, 424/248 [51] Int. Cl. ..C07d 87/40 [58] Field of Search ..260/267, 247.5

[56] References Cited UNITED STATES PATENTS 3,080,283 3/1963 Bijloo etal ..260/267 Primary Examiner-Alex Maze] Assistant Examiner-Jose Tovar Attorney-Samuel L. Welt, Jon S. Saxe, Bernard S.

Leon, Gerald S. Rosen and R. l-lain Swope [5 7] ABSTRACT 6-Substituted derivatives of l-phenazinol 5,10-dioxide which possess broad spectrum anti-microbial activity are disclosed.

9 Claims, N0 Drawings l-HYDROXY--AMINO ALKOXY-PHENAZINE 5 l O-DIOXIDES DESCRIPTION OF THE INVENTION This invention relates to novel 6-substituted derivatives of l-phenazinol 5,10-dioxide and to methods for their preparation. More particularly, the invention relates to derivatives of 1,6-phenazinediol 5,10-dioxide, the known antibiotic iodinin, which are prepared by monoalkylation of one of the two hydroxyl groups of 10 0 OR I I Q t H0 0 wherein R is selected from the group consisting of alkyl containing from four to 10 carbon atoms, halo-lower alkyl, lower alkenyl, lower alkynyl, amino-lower alkyl, di-lower alkylamino-lower alkyl, phthalimido-N-lower alkyl and Z-lower alkyl wherein Z signifies a five or six membered saturated heterocyclic ring containing a nitrogen atom and at most one further hetero atom consisting of oxygen and in cases where R signifies amino-lower alkyl, dilower alkyl-amino-lower alkyl and Z-lower alkyl, the pharrnaceutically acceptable acid addition salts thereof.

As used herein, the term alkyl denotes straight or branched chain saturated hydrocarbon radicals containing from four to 10 carbon atoms inclusive, such as butyl, 3-methylbutyl, pentyl, hexyl, heptyl and the like. The term lower alkyl denotes straight or branched chain saturated hydrocarbon radicals containing from one to seven carbon atoms inclusive, such as methyl, ethyl, propyl, isopropyl, butyl, pentyl, hexyl and the like, with groups containing from one to four carbon atoms being preferred. The term lower alkenyl denotes an unsaturated univalent aliphatic radical having at least one double bond and containing from three to seven carbon atoms inclusive, with groups containing from three to four carbon atoms being preferred. The term lower alkynyl denotes an unsaturated univalent aliphatic radical having at least one triple bond and containing from three to seven carbon atoms with groups containing from three to four carbon atoms being preferred. The term halogen" includes fluorine, chlorine, bromine and iodine unless expressly indicated otherwise.

In a preferred aspect, when R signifies Z-lower alkyl, Z being defined as above, the heterocyclic ring is saturated and represents a member selected from the group consisting of morpholino, piperidino, and pyrrolidino.

Representative of the compounds of formula I are:

6-( 3-methylbutoxy)- l -phenazinol 5,10-dioxide 6-heptyloxyl -phenazinol 5 IO-dioxide 6-decyloxy- 1 -phenazinol 5 1 O-dioxide -allyloxy-l-phenazinol 5,10-dioxide 6-( 2-propynyloxy)- l -phenazinol 5 l O-dioxide 6-( 3-phthalimidopropoxy l -phenazinol 5 l O-dioxide 6-( 3-aminopropoxy l-phenazinol 5 l O-dioxide 6-( 3-chloropropoxy l -phenazinol 5 l O-dioxide 6-( 3-pyrrolidinopropoxy)- l -phenazinol 5 IO-dioxide 6-( 3-dimethylaminopropoxy)- l -phenazinol 5, l 0- dioxide 6-( 3-piperidinopropoxy l-phenazinol 5, IO-dioxide 6-( 3-diethylaminopropoxy l-phenazinol 5, IO-dioxide 6-( 3-morpholinopropoxy l -phenazinol ide A preferred class of compounds falling within the scope of formula I are those wherein R signifies alkyl containing from four to 10 carbon atoms, halo-lower alkyl, lower alkenyl or lower alkynyl, i.e. compounds of the formula 5 l O-dioxwherein R, and R are the same and are selected from the group consisting of hydrogen or lower alkyl and the pharmaceutically acceptable acid addition salts thereof.

Most preferred of the compounds of formula I are:

6-( 3-methylbutoxy)- l -phenazinol 5 l O-dioxide 6-heptyloxyl -phenazinol 5 l O-dioxide 6-allyloxyl -phenazinol 5, l0-dioxide 6-( 2-propynyloxy l -phenazinol 5 IO-dioxide 6-( 3-aminopropoxy)- l-phenazinol 5 l O-dioxide 6-( 3-dimethylaminopropoxy l -phenazinol dioxide 6-( 3-diethylarninopropoxy)- l -phenazinol 5 IO-dioxide 6-( 3-pyrrolidinopropoxy l -phenazinol 5 lO-dioxide 6-( 3-morpholinopropoxy l -phenazinol ide Also included within the scope of the present invention are the pharmaceutically acceptable acid addition salts of the compounds of formula I wherein R is amino-lower alkyl, di-lower alkylamino-lower alkyl or Z-lower alkyl, Z being defined as above. This class of compounds falling within the scope of formula I form pharmaceutically acceptable acid addition salts with pharmaceutically acceptable organic and inorganic acids such as hydrochloric acid, hydrobrornic acid, sulfuric acid, phosphoric acid, nitric acid, tartaric acid, citric acid, salicylic acid, maleic acid, succinic acid, acetic acid and the like.

The compounds of formula I above may be prepared following a variety of procedures. The choice of procedure will depend upon the nature of the R substituent to be introduced into the phenazinol molecule.

For example, compounds of formula I wherein R signifies alkyl containing from four to carbon atoms, halo-lower alkyl, lower alkenyl, lower alkynyl, or phthalimido-N-lower alkyl can be prepared using con ventional alkylating techniques. This alkylating procedure is preferably carried out in two stages. In the first stage, the known compound l,6-phenazinediol 5,10-dioxide (iodinin), which is used as the starting material, is converted to its mono-alkali metal salt, preferably the potassium salt. The conversion of iodinin to its alkali metal salt is accomplished by reacting iodinin with an alkali metal base. This reaction is expediently effected in the presence of an aprotic polar organic solvent, such as hexamethylphosphoric triamide (HMPT), dimethylformamide (DMF) or dimethylsulfoxide (DMSO), with HMPT being preferred. Use of an aprotic polar organic solvent is preferred since these solvents can also be utilized in the alkylation step, thus eliminating the necessity of first isolating the iodinin salt. Suitable alkali metal bases that may be used to form the iodinin salt include alkali metal lower aikoxides containing from one to four carbon atoms. Preferred alkali metal lower alkoxides include the sodium and potassium compounds, with potassium t-butoxide being the most preferred alkali metal lower alkoxide.

In the second stage of the alkylation process, the monoalkali metal salt of iodinin is selectively alkylated by reacting said salt with a conventional alkylating agent. Suitable alkylating agents for this purpose include alkyl halides, alkyl sulfates, lower alkenyl halides, lower alkynyl halides, halo-lower alkyl halides, and phthalimido-N-lower alkyl halides. The halide compounds are preferably utilized and the bromides are the preferred compounds. Examples of suitable preferred alkylating agents include l-bromo-3-methyl-butane, I- bromo-heptane, l-bromo-decane, allyl-bromide, 1- bromo-2-propyne, l-bromo-3-chloropropane, 1- chloro-4-bromo-butane, and phthalimido-N-propyl bromide.

As indicated above, this selective alkylation of the monoalkali metal salt of iodinin is expediently effected in the presence of an aprotic polar organic solvent such as HMPT, DMF and DMSO, with HMPT being the preferred solvent. The alkylation reaction conditions can be varied. However, suitable conditions which are convenient and provide good yields include the use of temperatures between about 10 and about 70 C. and

reaction times sufficient to complete the reaction, usually from about I to about 24 hours. In a preferred aspect, the alkylation reaction is effected at room temperature, i.e. about 20 to 25 C.

In a further process aspect of the present invention, the novel compounds of formula I wherein the R substituent is an amino-lower alkyl group can be prepared by the solvolytic cleavage of a compound of formula I wherein the R substituent signifies a phthalimido-N- lower alkyl group. The solvolytic cleavage of the phthalimido derivative yields the desired amino compound. This solvolysis is effected by treating the phthalirnido derivative with a conventional solvolyzing agent such as monomethylamine. Further, this reaction is expediently effected in the presence of an inert organic solvent. Suitable solvents for this purpose include alcohols such as methanol, ethanol and the like. The solvolysis reaction conditions may be varied. However, suitable conditions which are convenient and provide good yields include the use of temperatures in the range of from about 10 to about C., with room temperature being preferred, and reaction times sufficient to complete the reaction, usually from about 1 to about 10 hours.

In a further process aspect of the present invention, the novel compounds of formula I wherein the R substituent signifies di-lower alkylamino-lower alkyl or Z- lower alkyl, wherein Z is as described above, can be prepared by reacting a compound of formula I wherein R signifies halo-lower aIkyl with the corresponding amine. Representative amines that may be used in this reaction include dimethylamine, diethylamine, morpholine, pipen'dine, pyrrolidine and the like. This reaction is expediently effected by dissolving the halolower alkyl compound in an excess of the amine or in the presence of an aprotic polar organic solvent such as DMSO. Temperature and reaction time are not critical to this process aspect. Thus, temperatures between about 10 and about 70 C. are suitable, with room temperature being preferred.

The novel compounds of formula I have been found to possess broad spectrum anti-microbial activity. In particular, these compounds have demonstrated a high level of activity against a wide variety of bacteria, yeast and fungi such as Streptococcus agalactiae, S taphylococcus aureus, Escherichia coli, Cornyebacterium pyogenes, Moraxella bovis, Pseudomonas aeruginosa, Candida albicans, and Microsporum canis. The novel compounds of this invention are particularly useful in the treatment of animal diseases of microbial origin. When the novel compounds of formula I are employed in the treatment of microbial infections, they are conveniently utilized in combination with suitable pharmaceutical carrier materials. These compositions are formulated by uniformly distributing the compound of formula I throughout a vehicle that is chemically compatible with the particular compound, non-inhibiting with respect to the active ingredient, and essentially non-injurious to the body tissue under the conditions of use. When formulated into compositions suitable for topical administration, the novel compounds of this invention are preferably employed in amounts ranging from about 0.05 to about 1.0 percent by weight of the composition. The compounds of this invention, when employed in forms suitable for topical administration, may be utilized in varied formulations: for example, in solid formulations including finely divided powders and granular material, in liquid formulations including solutions, suspensions, concentrations, tinctures, slurries, aerosols and the like. Further, they may be employed as creams, gels, jellies, ointments, pastes, etc.

The following examples further illustrate the scope of the invention. All temperatures given are in degrees centigrade unless indicated otherwise.

EXAMPLE 1 Preparation of 6-(3-methylbutoxy)-l-phenazinol 5,10- dioxide 2.44 grams of iodinin were suspended in 150 ml of hexarnethylphosphoric triamide (HMPT) and 1.3 g of potassium t-butoxide were added with stirring. The reaction mixture was stirred overnight and then m1 of l-bromo-3-methyl-butane were added. Stirring continued at room temperature for 24 hours. The reaction mixture was then poured into ice water and extracted three times with ethyl acetate. The extracts were diluted with benzene, washed with water, dried over magnesium sulfate and evaporated to dryness in vacuo. The residue was chromatographed on silica gel with methylene chloride/ethyl acetate. Fractions containing the desired product were combined and evaporated in vacuo. The material was recrystallized from dichloromethane/acetone to yield 6-( 3-methylbutoxy)-1- phenazinol 5,10-dioxide, mp. 12 1 (dec.).

EXAMPLE 2 Preparation of 6-heptyloxy-1-phenazinol 5,10-dioxide 2.44 grams of iodinin were suspended in 150 ml of HMPT. Then 1.3 grams of potassium t-butoxide were added with stirring. Stirring was continued overnight. Then 10 ml of n-bromo-heptane were added and the stirring was continued at room temperature for 24 hours. The reaction mixture was poured into ice water and extracted with ethyl acetate. Extracts were diluted with benzene, washed with water, dried over magnesium sulfate and evaporated to dryness. The residue was redissolved in 200 ml of CH Cl and applied to a chromatography column containing 250 g silica gel. The material was eluted with methylene chloride/ethyl acetate. Fractions containing the desired product were combined and evaporated in vacuo. The material was recrystallized from dichloromethane/acetone to yield 6-heptyloxy-l-phenazin0l 5,10-dioxide, m.p. 9l-93 (dec.).

EXAMPLE 3 Preparation of 6decyloxyl-phenazinol 5,10-dioxide 2.44 grams of iodinin were suspended in 150 ml HMPT. To this 1.3 grams of potassium t-butoxide were added with stirring. The stirring was continued overnight and then 10 m1 of l-bromo-decane were added and the stirring continued at room temperature for 24 hours. The reaction mixture was poured into ice water and extracted three times with ethyl acetate. The extracts were diluted with benzene, washed with water, dried over magnesium sulfate and evaporated to dryness. The residue was chromatographed on silica gel with methylene chloride/ethyl acetate. Fractions containing the desired product were combined and evaporated in vacuo. The material was recrystallized from dichloromethane/acetone to yield 6-decyloxy-lphenazinol 5,10-dioxide, m.p. 9295(dec.

EXAMPLE 4 Preparation of 6-allyloxy- 1 -phenazinol 5 l0dioxide 2.44 grams of iodinin were suspended in 150 ml of HMPT. To this was added with stirring 1.3 grams of potassium t-butoxide. The reaction mixture was stirred overnight and 2.5 ml of allyl bromide were then added and the stirring continued at room temperature for 5 hours. The reaction mixture was then poured into ice water and extracted three times with ethyl acetate. Extracts were diluted with benzene, washed with water, dried over magnesium sulfate and evaporated to dryness. The residue was chromatographed on silica gel with methylene chloride/ethyl acetate. Fractions containing the desired product were combined and evaporated in vacuo. The material was recrystallized from dichloromethane/acetone to yield 6-allyloxy-lphenazinol 5,10-dioxide, m.p. 142(dec.

EXAMPLE 5 Preparation of 6-(2-propynyloxy)-l-phenazinol 5,10- dioxide 2.44 grams of iodinin were suspended in 150 ml HMPT. To this was added with stirring 1.3 grams of potassium t-butoxide. The reaction mixture was stirred overnight and then 2 ml of 3-bromopropyne were added and stirring was continued at room temperature for 9 hours. The reaction mixture was then poured into ice water and extracted three times with ethyl acetate. The extracts were diluted with benzene, washed with water, dried over magnesium sulfate and evaporated in vacuo. The residue was chromatographed on 250 grams silica gel with CHC1 /ethyl acetate. Fractions containing the desired product were combined and evaporated in vacuo. The material was recrystallized from di-chloro methane/acetone to yield 6-(2- propynyloxy)-l-phenazinol 5,10-dioxide, m.p. 152 (dec.).

EXAMPLE 6 Preparation of l-( 3-phthalimidopropoxy)-1- phenazinol 5, 10-dioxide 7.32 grams of iodinin, 450 ml HMPT and 3.9 grams of potassium tertiary butyl alcoholate were placed in a flask and stirred at room temperature overnight. To this was added 15 grams of N-(3-bromopropyl)phthalimide and stirring was continued for 17 hours. The reaction mixture was then poured into four liters of ice water and allowed to stand for 30 minutes. The precipitated solids were filtered and washed with 2 X 1 liter of water. The product was then washed with 300 ml of methanol and air dried to yield l-( 3- phthalimidopr0poxy)-l-phenazinol 5,10-dioxide as a red powder, m.p. 161 (dec.

EXAMPLE 7 Preparation of 6-(3-aminopropoxy)-l-phenazinol 5, l0- dioxide hydrochloride 5 grams of l-( 3-phthalimidopropoxy)- l -phenazinol 5,10-dioxide were dissolved in 1,000 ml of ethanol containing grams of monomethylarnine. The solution was stirred at room temperature for 4% hours. It was then concentrated to approximately half the volume, and then diluted with 1,500 ml of water and extracted with 4 X 1,000 ml of chloroform. The combined extracts were extracted with 4 X 150 ml of 10 percent hydrochloric acid. The acidic solution was made alkaline with anhydrous sodium carbonate and this was extracted with 4 X 1,000 ml of chloroform. The chloroform extracts were dried over sodium sulfate and evaporated in vacuo. The residue was redissolved in chloroform and the chloroform solution was shaken with approximately 15 percent aqueous l-lCl. The hydrochloride salt precipitated and was collected by filtration. The filter cake was washed with acetone and dried to yield 6-( 3-aminopropoxy)-l-phenazinol 5,10- dioxide hydrochloride, m.p. 137 1 38 (dec.

EXAMPLE 8 Preparation of 6-(3-chloropropoxy)-l-phenazinol, 10-dioxide 7.32 grams of iodinin were suspended in 450 ml of HMPT. To this was added with stirring at room temperature 3.9 grams of potassium tertiary butyl alcoholate. Stirring was continued over night. l8 ml of lbromo-3-chloropropane were added and stirring was continued at room temperature for 24 hours. The reaction mixture was then poured into 3,500 ml of ice water. The precipitate was filtered off, washed with water and ml of acetone. The filter cake was dried in vacuo and purified by chromatography on 500 grams of silica gel with dichloromethane/ethyl acetate. Fractions containing the desired product were combined and evaporated in vacuo to yield 6-(3-chloropropoxy)-lphenazinol 5,10-dioxide, m.p. 137(dec.).

EXAMPLE 9 Preparation of 6-( 3-dimethylaminopropoxy l phenazinol 5, l O-dioxide Into a sealed tube was placed 2.0 grams of 6-(3- chloropropoxy)-l-phenazinol 5,10-dioxide. The tube was cooled in dry-ice-acetone and 80 ml of dimethylamine was condensed into the tube. The tube was sealed and shaken at room temperature for 70 hours. The tube was then opened and excess dimethylamine allowed to evaporate at room temperature. The residue was dissolved in CHCl solution, was washed with water and was then extracted with 3 X 150 ml 10 percent aqueous HCl. The combined acid extracts were made basic with sodium carbonate, extracted with CHCL, and the combined CHCl extracts were washed with water, dried over sodium sulfate and concentrated in vacuo. The residue was recrystallized from acetone/ether to yield 6-( 3- dimethylaminopropoxy)- l -phenazinol 5, l0-dioxide, mp. 103 C. (dec.).

EXAMPLE 10 for 22 hours. The reaction mixture was then diluted with 400 ml Cl-lCl and washed first with very dilute acetic acid and then with water until the Water washes were neutral. The CHCl layer was extracted with 10 percent aqueous HCl. The combined HCl extracts were neutralized with sodium carbonate and extracted with ethyl acetate. The combined ethyl acetate extracts were washed with water, dried over sodium sulfate and concentrated in vacuo. The residue was slurried with ether/pentane (1:1) and filtered to yield red crystals of 6-( 3-diethylaminopropoxy)- l -phenazinol 5 l O-dioxide, m.p. 78-80 (dec.).

EXAMPLE 11 Preparation of 6-( 3-pyrrolidinopropoxy l -phenazinol 5,10-dioxide 2.0 grams of 6-(3-chloropropoxy)-l-phenazinol 5,10-dioxide and 20 ml of pyrrolidine were placed in a flask and stirred at room temperature for 3% hours. The reaction mixture was diluted with CHCl and washed repeatedly with water until the water washes were neutral. The chloroform solution was extracted with 3 X 150 ml of 10 percent aqueous HCl. The acid extracts were combined, neutralized with sodium carbonate, extracted with CHCl and the combined Cl-lCl extracts were washed with water and dried over sodium sulfate and concentrated in vacuo. The residue was recrystallized from acetone. The solids were filtered and washed with a little ether and dried in vacuo at 50 for 16 hours to yield metallic red crystals of 6-( 3-pyrrolidinopropoxy 1 -phenazinol 5 lO-dioxide, m.p. 1l31 14C (dec.).

EXAMPLE l2 Preparation of 6-( 3-morpholinopropoxy)- l -phenazinol 5,10-dioxide 1.0 gram of 6-( 3-chloropropoxy)-l-phenazinol 5,10- dioxide and 10 ml of morpholine were placed in a flask and stirred at room temperature for 23 hours. The reaction mixture was diluted with water and extracted with CHCl several times. The CHCl extracts were combined and washed repeatedly with water until neutral. The organic layer was extracted with 10 percent aqueous l-lCl several times. The acid extracts were combined, were made basic with sodium carbonate and extracted with CHC] several times. The combined Cl-lCl extracts were washed with water, dried over sodium sulfate and concentrated in vacuo. The residue was recrystallized from acetone to yield 6-(3- morpholinopropoxy l -phenazinol 5 l O-dioxide, m .p. C. (dec.).

EXAMPLE 13 Preparation of 6-(3-piperidinopropoxy)-l-phenazinol 5,10-dioxide 6 grams of 6-( 3-chloropropoxy)-l-phenazinol 5,10- dioxide and 40 ml piperidine were placed in a flask and stirred at room temperature for 21 hours. The reaction mixture was diluted with 500 ml of chloroform. The mixture was then washed with water until the aqueous washes were neutral, extracted with 3 X 250 ml of 10 percent HCl. Combined acid extracts were neutralized with sodium carbonate and extracted with 4 X 500 ml of chloroform. The chloroform extracts were washed with water, dried over sodium sulfate and evaporated in vacuo. The residue was recrystallized from acetone and dried for 16 hours at 50 C to yield 6-(3-piperidinopropoxy)-l-phenazinol 5,10-dioxide, m.p. 92-97 C (dec.).

We claim: 1. A compound of the formula 3. The compound of claim 9 wherein the amino lower alkyl group is S-aminopropyl, i.e. 6-(3- aminopropoxy)-l-phenazinol 5,10-dioxide hydrochloride.

4. A compound of claim 1 wherein R" is di-lower alkylamino-lower alkyl group.

5. The compound of claim 4 wherein the di-lower alkylarnino-lower alkyl group is dimethylaminopropyl, i.e. 6-(3-dimethylamino-propoxy)-l-phenazinol 5,10- dioxide.

6. The compound of claim 4 wherein the di-lower alkyl-amino-lower alkyl group is diethylaminopropyl, i.e. 6-(3-diethyl-aminopropoxy)-l-phenazinol 5, 10- dioxide.

7. A compound of claim 1 wherein R" is Z-lower alkyl wherein Z is morpholino, piperidino or pyrrolidino.

8. The compound of claim 7 wherein the Z-lower alkyl group is 3-pyrrolidinopropyl, i.e. 6-(3-pyrrolidinopropoxy l -phenazinol 5, iO-dioxide.

9. The compound of claim 7 wherein the Z-lower alkyl group is 3-morpholinopropyl, i.e. 6-(3- morpholinopropoxy l -phenazinol 5 l O-dioxide.

UNITED STATES PATENT @FFKCE ETENATE @F QGREQTN 3, 1,351 Dated August 1, 1972 Patent No Invent r( Leimgruber and weigele It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 10, line 1 of Claim 3 The compound of claim 9 should be The compound of claim Signed and sealed this 30th day of January 1973e (SEAL) Attest:

EDWARD M.FLETCHER,JR. ROBERT GOTTSCHALK Attesting Officer Commissioner of Patents ORM M050 uscoMM-oc scam-pea ",5. GOVRNMINT PRINTING Q'Flcl I 969 0-366-51 

2. A compound of claim 1 wherein R'''' is amino-lower alkyl.
 3. The compound of claim 9 wherein the amino-lower alkyl group is 3-aminopropyl, i.e. 6-(3-aminopropoxy)-1-phenazinol 5,10-dioxide hydrochloride.
 4. A compound of claim 1 wherein R'''' is di-lower alkylamino-lower alkyl group.
 5. The compound of claim 4 wherein the di-lower alkylamino-lower alkyl group is dimethylaminopropyl, i.e. 6-(3-dimethylamino-propoxy)-1-phenazinol 5,10-dioxide.
 6. The compound of claim 4 wherein the di-lower alkyl-amino-lower alkyl group is diethylaminopropyl, i.e. 6-(3-diethyl-aminopropoxy)-1-phenazinol 5,10-dioxide.
 7. A compound of claim 1 wherein R'''' is Z-lower alkyl wherein Z is morpholino, piperidino or pyrrolidino.
 8. The compound of claim 7 wherein the Z-lower alkyl group is 3-pyrrolidinopropyL, i.e. 6-(3-pyrrolidinopropoxy)-1-phenazinol 5, 10-dioxide.
 9. The compound of claim 7 wherein the Z-lower alkyl group is 3-morpholinopropyl, i.e. 6-(3-morpholinopropoxy)-1-phenazinol 5,10-dioxide. 